Add PureScript LSP/Highlighting support

[ivanmoreau]

This PR adds basic support for the language using the purescript-language-server.

Release Notes:

• Added support for PureScript.

[ivanmoreau]

An example of the LSP/Highlighting properly working.

[maxdeviant]

We have an async_maybe! macro in our util crate that can make this a bit nicer than having the IIFE.

Here's an example of it used in another LSP adapter:

zed/crates/zed/src/languages/gleam.rs

Line 104 in 5b9cc26

async_maybe!({

[maxdeviant]

I'm seeing some weird output in the generated assets/licenses.md file after running script/generate-licenses.

Namely, it seems we're pointing to the tree-sitter-php repo:

* [tree-sitter-purescript 1.0.0]( https://github.com/tree-sitter/tree-sitter-php )

It looks like the cause is that Cargo.toml is pointing to the wrong repository: https://github.com/ivanmoreau/tree-sitter-purescript/blob/4f623d7d245e76f8ab2a5ea663d8a257d48fbd97/Cargo.toml#L7

[ivanmoreau]

Hi @maxdeviant!

I solved the mentioned problems, including the removal of some code that wasn't essential for the functionality (it was merely a leftover from an existing implementation with Node that I used as a template).

[maxdeviant]

Looks good! Thanks for getting this added, @ivanmoreau!